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The usability of the software system for capturing picture is important factor for the mobile phone's interface design, which will partly determine customers' appreciation of the value of the service. Review from a human factors perspective, there are various methods for evaluating usability However, there are no definite criteria for testing the usability of mobile phone camera software systems. This study presents a new framework for usability testing based on a typical human information processing. Usability is classified into four dimensions for testing: perception, learning/memorization, control/action and evaluative feeling. Furthermore, the criteria for testing the four dimensions of usability are defined for mobile phone camera software systems. Three different camera mobile phones are studied and compared based on task analysis and evaluation of the criteria proposed for usability testing in this study. The usability problems of three mobile phone camera software systems are identified. Suggestions for usability improvement are presented.

If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -The purpose of this research is to aim to improve the cognitive understanding of knowledge processing and provide a cognitive knowledge modeling method in product design.Design/methodology/approach -In this paper, a cognitive model of knowledge processing is described. A cognitive knowledge modeling method is presented. Suggestions on cognitive support for knowledge based systems are provided.Findings -There is often a fundamental mismatch between the way human process knowledge and the way it is processed by technology for supporting product design. It is necessary to develop tools, methods and technology which integrate seamlessly with the design process. This study focuses on the internal human activities and explores knowledge management research from a human factors perspective. Cognitive knowledge modeling will result in a natural integration of knowledge-based systems into the design process.Research limitations/implications -This study uses an experimental approach and hopefully the research can therefore be generalized to other situations.Practical implications -This study provides guidelines for cognitive support for knowledge-based systems.Originality/value -Cognitive knowledge processing is described and a cognitive knowledge modeling method is presented. The paper explores knowledge management research by analyzing human activities, in combination with the study of management and engineering technologies.

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